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My dog is sucking her nipples. Why are they bruised and sore?

Updated on September 23rd, 2025

Pet's info: Dog | Mixed Breed | Female | unspayed | 9 years and 8 months old | 6 lbs

My dog keeps sucking on her nipple, she is not pregnant and her nipples are Bruced because she keeps doing it . Why is this strange behavior?

1 Answer

Most Helpful Answer

Summer Walker, DVM, MS

Answered By Summer Walker, DVM, MS

Veterinarian

Published on August 22nd, 2017

Thank you for using Petco Pet Education Center, formerly Petcoach! Missy engaging in nipple sucking could be a behavioral change, but it could also be due to underlying discomfort associated with that nipple/mammary gland. Scheduling a visit with Missy's veterinarian would be beneficial to get a good palpation of the mammary glands associated with the nipples she is sucking to make sure there are no masses palpable. If she receives a clean bill of health, then it could be a behavioral change she is exhibiting.
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